| PCR primers, designed to cover well-annotated human exons, are used to |
| amplify 48 DNA from the CEPH families. The products are sequenced |
| using both forward and reverse primers and the sequences are compared |
| to each other and the genomic reference using ExoTrace. |
| Exotrace identifies high-quality differences between the sequences, |
| identfying heterozygous sequences by comaparing the heights of the peaks |
| observed. |
| SNPs are classified according to the degree of supporting data available: |
| SHW2 All 3 possible genotypes seen in double stranded DNAs |
| SHW1 All 3 possible genotypes seen - one dependant on single stranded DNA |
| MHo2 Both possible homozygotes are seen in multiple double-stranded DNA |
| MHe2 One homozygote and the heterozygote are seen in multiple double-stranded DNA |
| SHo2 Both possible homozygotes are seen - one in only a single double-stranded DNA |
| SHe2 One homozygote and the heterozygote - one in only a single double-stranded DNA |